Ventilator



Jan. 19, 1954 c. L. AMMERMAN VENTILATOR 2 Sheets-Sheet 1 Filed March 22, 1952 HVVENTUR e/YLI/We/Wow BY Jan. 19, 1954 c. L. AMMERMAN 2,666,378

VENTILATOR Filed March 22, 1952 2 Sheets-Sheet 2 Patented Jan. 19, 1954 UNITED STATES ?ATENT OFFICE VENTILATOR.

. Cecil L. timmerman, Minneapolis, Min-n. Application March 22, 1952, serial No. 278,062

(on sis- 43) I Claim. 1 o

My presen-t invention relates to improvements in ventilators of the type disclosed in my United States Letters Patent No. 2,571,513, issued October 16, 1951.

An object of this invention is to provide a natural draft ventilator supplemented by a motor-driven fan.

Another object is to provide a novel ventilator in which the motor for operating the fan is entirely out of the line of air flow.

Still another object is to provide a novel storm band having a novel motor base or mount.

A further object is to provide a novel fan housing having a break-out plate.

A still further object is to provide a, novel arrangement of a motor and a fan to facilitate the mounting and the cooling of the motor.

Another object is to provide a ventilator having 'aerodynamically correct curves that cause air to freely flow through and out of the ventilator to atmosphere by natural draft or when supplemented by a motor-driven fan without causing turbulence or back pressure.

Other objects will be apparent from the following description, reference being had to the drawings.

To the above end, generally stated, the invention consists of the novel devices and combination of devices hereinafter described and defined in the claim.

In the accompanying drawings, which illustrate the invention, like characters indicate like parts throughout the several views.

Referring to the drawings:

Fig. 1 is a View principally in vertical section taken centrally through the improved ventilator; and

Figs. 2, 3, and 4 are views partly in plan and partly in horizontal section taken on the lines 2 2, 3 3 and 4 4 of Fig. 1, respectively.

The numeral indicates a flat sheet metal base having a capping flange 6 and a central upstanding upwardly tapered throat 'l that is square at its lower end and round at its upper end. This tapered throat 'I affords the air intake of a venturi. When the ventilator is installed, its base 5 rests on a curbing built into a roof structure with the capping flange 6 overlapping said curbing to form a weather-tight joint between the ventilator and the curbing. Also, when the ventilator is installed, the throat 'I forms an eX- tension of a stack through which air is drawn and discharged to the atmosphere by the ventilator. For the purpose of this case, it will not be necessary to show the curbing and the stack as they are conventional and form no part of this invention. A ring 8. formed of an angle bar has one of its flanges turned' downwardly, encircles the upper end portion of the throat I and is secured thereto. The other ange of, the ring 8 is turned outwardly.

A horizontally disposed fan` housing 9 rests centrally on the ring 8 and secured thereto by stove bolts I0. This housing 9 has a. discharge throat I'I' and the top and bottom members I2 and f3 thereof are ii'at and parallel. The side wall It of the housing 9 is in the form of a scroll that extends from. one side of the throat l I to the other. The side wall I( progressively increases in diameter from the short side of the throat II to the long side thereof. In other words, this diameter progressively increases in the direction of the rotation of a sirocco fan I5 journaled in the housing 9.

A. large hole I6 in the housing bottom member I 3, coincident with the throat 'I, alfords a passageway from said throat to the interior of the housing 9'. The edge portion of the housing bottom member I3 surrounding the hole IS is curved outwardly and upwardly to afford an annular stiifening member l for said bottom member.

A. break-out plate Il in the throat II is formed by extending the side wall I4 into the throat II- on the short side thereof. The vertical edge portion of the break-out plate i'I is turned outwardly in the throat I I, as indicated at I8. The purpose of the break-out plate I8 is to prevent air discharged into the throat II and out of the maximum force of the fan I5 from being drawn into the housing 9 by the fan I5 and recirculated.

Resting on the housing top member I2 is a storm band I9 capping the housing 9 and formed of a single sheet of metal. The storm band I9 comprises a fiat horizontal head member 2t and an annular apron 2| encircling said head member. The apron 2l is outwardly and downwardly inclined on a reverse curve to substantially the plane of the bottom member I3 of the housing 9. Stove bolts I9' detachably secure the storm band i9 to the housing 9. In some instances, it might be desirable to eliminate the housing top member I2 and secure the housing side member i4 to the storm band head member 20.

The head member 20 of the storm band I9, at its center, is upwardly offset to afford a flat motor base or mount 22. The head member 2B is curved upwardly to the motor mount 22 to stiiien the storm band I9. An electric motor 23 which rests on the mount 22, with its armature .shaft 2d in a depending position, is secured to the 3 mount 'l2 by stove bolts 25. The lower bearing of the motor 22 extends through a large hole El in the motor mount 22 and the armature shaft 2li extends into a sleeve 28 in a hub 29. This hub 29 extends through a large hole 38 in the housing top member i2 and has on its lower end an outturned iiange 3l that rests on the top member- 32 of the fan l5 and is secured thereto by rivets 33.

The fan i5 is secured to the armature shaft 2li, to be rotated thereby, by a set screw 35 having threaded engagement with the hub 29, extends through a hole in the sleeve 28 and impinges the armature shaft 2d. The fan blades 35 are cireumierentially spaced about the top member 32 and are secured to their upper ends thereto. These blades 35 are secured at their lower ends to a fiat ring 36 that has a working clearance with the stiffer/ling member IB.

It will be noted that there is considerable space between the motor 23 and the fan I5 which greatly facilitates the cooling of said motor and the manipulation of the stove bolts 25 in mounting the motor 23 on the mount 22 or in removing the same therefrom. v

The motor 23 is covered by an annular cap 31 having a central upwardly bulged portion 33 and outwardly of this bulge portion the cap 31 is outwardly and downwardly curved and rests at its perimeter on the storm band I9. Stove bolts 39 detachably secure the cap 37 to the storm band it. The space within the cap 37 affords a motor compartment im.

The novel shape of the apron 2! permits a free flow of air from the throat l! to atmosphere and at the same time prevents wind from blowing into the throat i l and the housing 9, thus interfering with the flow ci air from the throat il and the operation of the fan l5. This apron 2| also prevents rain or snow from being blown into the throat l I and the housing 9.

While there are herein disclosed but a limited number of embodiments of the structure, process and product of the invention herein presented, it is possible to produce still other embodiments without departing from the inventive concept herein disclosed, and it is desired, therefore, that only such limitations be imposed on the appended claim as are stated herein, or required by the prior art.

What I claim is:

In a ventilator, a base having an upstanding central intake throat that is upwardly tapered to an annular member, the side wall of which is parallel to the axis of the throat, a fan housing having parallel top and bottom members and a side wall perpendicular to the top and bottom members, said housing having a discharge throat between said top and bottom members perpendicular to the axis of the intake throat, the side walls of the housing progressively increasing in diameter from one side of the discharge throat to the other, an annular nange fixed to the bottom member oi the housing capping the annular member of the intale throat and removably supporting the housing thereon, said housing bottom member having a large hole concentric with the axis of the inta-he throat, the bottom member surrounding the hole therein being upwardly offset to afford a stifiening member therefore, a stormV band comprising a hat horizontal head member and an apron on said head member resting on the housing top member1 and extending to the outer edge thereof, said apron being outwardly of the housing and extending from said top member substantially to the bottom member and in crossscction being in the form of a reverse curve, the central portion of the body member being upwardly offset to aford a motor base, Vsaid head. member being detachably secured tothe housing top member, an electric motor mounted on the motor base with its armature shaft extending into the housing, a sirocco fan in the housing hired to the armature shaft of the motor and a cap encasing the motor and resting on the apron and detachably secured thereto.

CEC'iL L. AMMERMAN.

References Cited in the file of this patent UNITED STATES PATENTS Number Name Date 2,134,142 Orear Oct. 25, 1938 2,157,609 Hopkins May 9, 1939 2,188,741 Roberts Jan. 30, 1940 2,526,290 Solzman Oct. 17, 1950 2,582,902 Gohl J an. 15, 1952 

